A South Australian Supreme Court jury has heard that a New Zealand man accused of murdering Robert Sabeckis at Maslin Beach almost 20 years ago did shoot him - but "the issue of self-defence would arise" during the trial.
Paul Beveridge Maroroa, 44, has pleaded not guilty to the shooting murder of Mr Sabeckis at a car park at Maslin Beach, in Adelaide's south, on January 13, 2000.
Opening the prosecution case today, Sandi McDonald SC told the jury of seven women and five men that Mr Maroroa "gunned down" Mr Sabeckis in that car park about 1:30am.
She said Mr Maroroa's DNA was linked to a sawn-off shotgun that was found near the murder scene.
The jury was also told that DNA profiles of both Mr Sabeckis and Mr Maroroa were found on an airbag that had been deployed in the victim's car after it crashed into a tree.
That car, Ms McDonald submitted to the jury, was used by Mr Maroroa to flee the scene.
The jury heard that about 16 hours after the shooting, a man snorkelling off Aldinga Beach saw what he thought was a shark fin in the water but soon realised it was a bag that had been weighed down by rocks.
"He was aware there had been an incident at Maslin Beach earlier that day.he took it to police," she said.
Jeans and part of gun found in bag
Ms McDonald said a pair of blood-stained jeans and the stock belonging to a shotgun were found inside the bag.
"At the time, [the beach] was 500 metres from where the accused was living," she said.
She said the sawn-off shotgun was found wrapped in a jacket at a private property near the murder scene.
The jury was told that police traced the serial number of the shotgun to a man whose son was friends with Mr Maroroa, as the pair "mixed in the same circles".
Ms McDonald said the firearm was stolen from that man's house on December 31, 1999, before the house was set alight.
"It's the prosecution case that the accused was the person who stole the shotgun. He went there with a clear purpose," she said.
"He took that gun to the beach where he shot and killed Robert Sabeckis."
Ms McDonald said the killer also inflicted one "final act of humiliation" by pulling Mr Sabeckis' pants down to expose his genitals after the shooting.
Defence: It's not a 'clear-cut case of murder'
Heath Barklay, for Mr Maroroa, then briefly outlined the defence case.
"This case is not about whether the accused shot the deceased - he did," he said.
"He accepts that he was there, he accepts that he shot the accused with a shotgun, he accepts that he drove from the scene in the deceased's car and crashed that car on a straight road.
"He accepts that he discarded the shotgun in the jacket, he accepts that he put a gun bag and some parts in the ocean.
"They are the facts that are not in dispute."
Mr Barklay said the crime scene and the injuries did not "paint a clear-cut case of murder".
"The prosecution case for murder is based on the two gunshot wounds, therefore he must have been murdered," he said.
"It makes emotive statements to the effect he was gunned down.
"They don't, in fact, know what happened.
"The issue of self-defence will arise."
The trial, before Justice Sam Doyle, is expected to run for three weeks.